Structure and performance of a novel TiO2-phosphonate composite photocatalyst

Raja, P.; Надточенко, В. А.; Klehm, U.; Kiwi, J.

doi:10.1016/j.apcatb.2007.12.015

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…[ 22 ] However, unlike the carboxylate‐based MOFs, phosphonate‐based MOFs for photocatalytic H 2 evolution (e.g., titanium phosphonate MOFs), and especially the corresponding mechanism, have thus far been understudied. [ 23 ] Studies in open literatures are inclined to relate the improved photocatalytic performance to the increased light harvest, [ 14,23–26 ] while the electronic properties have not been thoroughly investigated yet. Understanding the structure–activity relationship for the phosphonate‐based MOFs with engineered molecular structures in photocatalytic hydrogen production is envisioned to be significantly beneficial for the future design of photocatalytic systems.…”

Section: Figurementioning

confidence: 99%

Highly Stable Phosphonate‐Based MOFs with Engineered Bandgaps for Efficient Photocatalytic Hydrogen Production

et al. 2020

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Sunlight-driven water splitting to produce H 2 is an active field of energy research due to its promising potential to obtain renewable energy sources in a sustainable way. [1] One of the key requirements for achieving water photolysis with high "solar-tohydrogen" efficiencies is developing efficient photocatalysts. [2,3] Photoactive metal-organic frameworks (MOFs) represent one of the most promising materials for photocatalytic hydrogen production, but phosphonate-based MOFs have remained largely underdeveloped compared to other conventional MOFs. Herein, a photocatalyst of 1D titanium phosphonate MOF is designed through an easy and scalable stirring hydrothermal method. Homogeneous incorporation of organophosphonic linkers can narrow the bandgap, which is due to the strong electron-donating ability of the OH functional group that can efficiently shift the top of the valence band, moving the light absorption to the visible portion of the spectrum. In addition, the unique 1D nanowire topology enhances the photoinduced charge carrier transport and separation. Accordingly, the titanium phosphonate nanowires deliver remarkably enhanced photocatalytic hydrogen evolution activity under irradiation of both visible light and a full-spectrum simulator. Such concepts of engineering both nanostructures and electronic states herald a new paradigm for designing MOF-based photocatalysts.

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Section: Figurementioning

confidence: 99%

Highly Stable Phosphonate‐Based MOFs with Engineered Bandgaps for Efficient Photocatalytic Hydrogen Production

et al. 2020

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“…The development of immobilized photocatalysts is aimed at conquering the difficulty of recycling powder photocatalysts. The preparation methods for immobilized photocatalysts include sol-gel hydrolysis [ 33 , 34 ], hydrothermal synthesis [ 35 ], electrophoretic deposition [ 36 ], sputering [ 37 ] and electrospinning [ 38 ]. The adhesion strength is related to the service life of photocatalysts, which are varied with preparation methods.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of Immobilized Surfactant-Modified PANi-CNT/TiO2 under Visible-Light Irradiation

et al. 2017

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Hydrothermally and sol-gel-synthesized immobilized surfactant-modified polyaniline-carbon nanotubes/TiO2 (PANi-CNT/TiO2) photocatalysts were prepared and their application in the degradation of diethyl phthalate (DEP) under visible light at 410 nm was investigated in this sturdy. To improve the dispersion of nanoparticles and the transfer of electrons, the TiO2 surface was modified with both sodium dodecyl sulfate (SDS) and functionalized carbon nanotubes (CNT-COOH and CNT-COCl). With the addition of PANi, which was increased from 1–5%, the adsorption edge of the prepared photocatalysts shifted to 442 nm. The SDS linked the PANi polymers to achieve a thickness of coating of the film of up to 314–400 nm and 1301–1600 nm for sol-gel hydrolysis and hydrothermally-synthesized photocatalysts, respectively. An appropriate film thickness would extend the transfer path of the electrons and inhibit the recombination of the electrons and the electron-holes. The photo-degradation performance of DEP by the hydrothermally-synthesized photocatalysts was better than those by sol-gel hydrolysis. The results revealed that the hydroxyl radicals were the key oxidant in the degradation of DEP using hydrothermally-synthesized PANi-CNT/TiO2 photocatalysts. The morphology and functional groups of the raw materials of photocatalysts were characterized and a comparison of photocatalytic activity with other TiO2-based photocatalysts was also provided.

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“…This approach has also been used to degrade several aromatic compounds in aqueous solution [8][9][10]. Our laboratory has reported Raschig rings coated by TiO 2 as a catalyst to degrade phenol-compounds [11], phenol [12] and chlorophenols [13]. This study addresses the preparation of Raschig rings coated with TiO 2 but adding small amounts of a 3d-transition element like Cu/Cu-ions to extend its absorption into the visible region with the objective of increasing the dye degradation kinetics under solar light.…”

Section: Introductionmentioning

confidence: 99%

Cu-decorated Raschig-TiO 2 rings inducing MB repetitive discoloration without release of Cu-ions under solar light

Suárez

Zhang

Teixidó

et al. 2017

Journal of Environmental Chemical Engineering

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A B S T R A C TThe methylene blue (MB) discoloration on innovative photocatalysts made up of Raschig-rings coated by pre-formed TiO 2 nanoparticles decorated with CuOx (RR@TiO 2 -Cu) is presented. The MB-discoloration was drastically accelerated by the subsequent addition of 0.004% Cu. This Cu-content being $3000 times below the TiO 2 present in the RR@TiO 2 samples led to MB-discoloration in shorter times. The Cu-ions released from the RR@TiO 2 -Cu 0.004% were determined 1ppb by inductively coupled plasma massspectrometry (ICP-MS). Cu-percentages >0.018% decreased the MB-discoloration kinetics due to the Cu acting as recombination sites for the photogenerated charges. The total organic carbon (TOC) reduction concomitant with the MB-discoloration is reported as well as the effect of the initial MB-concentration and pH on the discoloration kinetics. The Cu-addition shifted significantly the TiO 2 absorption into the visible region even when added in sub-microgram quantities (0.004%) to RR@TiO 2 as detected by diffuse reflectance spectroscopy (DRS). The Cu level added to RR@TiO 2 was too low to be detected by X-ray diffraction (XRD). The roughness of the RR@TiO 2 -Cu (0.018%-0.081% Cu) presented Rg-values between 11.8 nm and 23.9 nm. The RR@TiO 2 Cu presented agglomerate sizes of $200 nm for TiO 2 and for the Cu aggregates sizes of $20 nm. The MB discoloration kinetics and reuse of the RR@TiO 2 -Cu suggest the potential as a supported catalyst in environmental cleaning process. A reaction mechanism is suggested taking into consideration the role of the Cu 1+/2+ intra-gap states involving redox catalysis as detected by X-ray photoelectron-spectroscopy (XPS).

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Structure and performance of a novel TiO2-phosphonate composite photocatalyst

Cited by 12 publications

References 18 publications

Highly Stable Phosphonate‐Based MOFs with Engineered Bandgaps for Efficient Photocatalytic Hydrogen Production

Highly Stable Phosphonate‐Based MOFs with Engineered Bandgaps for Efficient Photocatalytic Hydrogen Production

Preparation and Application of Immobilized Surfactant-Modified PANi-CNT/TiO2 under Visible-Light Irradiation

Cu-decorated Raschig-TiO 2 rings inducing MB repetitive discoloration without release of Cu-ions under solar light

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